Preparation method of L-proline
A proline and crystallization technology, applied in the preparation field of L-proline, can solve the problems of low light transmittance value of the product, increase the discharge of three wastes, affect product quality, etc., and achieve high product purity, low production cost, and concentration time. short effect
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Embodiment 1
[0021] The invention provides a technical scheme: a preparation method of L-proline, comprising the following steps:
[0022] Step 1: Filtrating the proline fermentation broth through a filter membrane to obtain an ultrafiltrate, which is washed with pure water to obtain a microfiltrate;
[0023] Step 2: filter the microfiltrate successively through a weakly basic anion resin and a weakly acidic cation resin to obtain a filtrate;
[0024] Step 3: adding activated carbon to the filtrate for decolorization and filtering to obtain a decolorization solution containing proline;
[0025] Step 4: Evaporating and concentrating the decolorized solution to obtain a concentrated solution, the content of which is 45%;
[0026] Step 5: Cool the concentrated solution to 10°C for natural crystallization, and obtain wet crystallization after centrifugation;
[0027] Step 6: Dry the wet crystals in a vacuum dryer to obtain the finished L-proline product.
[0028] In step 1, a ceramic membra...
Embodiment 2
[0035] The invention provides a technical scheme: a preparation method of L-proline, comprising the following steps:
[0036] Step 1: Filtrating the proline fermentation broth through a filter membrane to obtain an ultrafiltrate, which is washed with pure water to obtain a microfiltrate;
[0037] Step 2: filter the microfiltrate successively through a weakly basic anion resin and a weakly acidic cation resin to obtain a filtrate;
[0038] Step 3: adding activated carbon to the filtrate for decolorization and filtering to obtain a decolorization solution containing proline;
[0039] Step 4: Evaporating and concentrating the decolorized solution to obtain a concentrated solution, the content of which is 45%;
[0040] Step 5: Cool the concentrated solution to 10°C for natural crystallization, and obtain wet crystallization after centrifugation;
[0041] Step 6: Dry the wet crystals in a vacuum dryer to obtain the finished L-proline product.
[0042] In step 1, a ceramic membra...
Embodiment 3
[0049] The invention provides a technical scheme: a preparation method of L-proline, comprising the following steps:
[0050] Step 1: Filtrating the proline fermentation broth through a filter membrane to obtain an ultrafiltrate, which is washed with pure water to obtain a microfiltrate;
[0051] Step 2: filter the microfiltrate successively through a weakly basic anion resin and a weakly acidic cation resin to obtain a filtrate;
[0052] Step 3: adding activated carbon to the filtrate for decolorization and filtering to obtain a decolorization solution containing proline;
[0053] Step 4: Evaporating and concentrating the decolorized solution to obtain a concentrated solution, the content of which is 50%;
[0054] Step 5: Cool the concentrated solution to 10°C for natural crystallization, and obtain wet crystallization after centrifugation;
[0055] Step 6: Dry the wet crystals in a vacuum dryer to obtain the finished L-proline product.
[0056] In step 1, a ceramic membra...
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